Craft & Design
Tim Hunkin explains it all

Tim Hunkin is known for his automata – the Disgusting Spectacle at Maker Faire 2007 was inspired by one of his pieces. He’s also a talented explainer. You can find entertaining explanations for a huge range of topics at his site, Rudiments of Wisdom.

Tim Hunkin’s giant automaton clock for the London Zoo
The Secret life of Machines – videos